[jira] [Commented] (LUCENE-3126) IndexWriter.addIndexes can make any incoming segment into CFS if it isn't already

["Michael McCandless (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-3126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036481#comment-13036481 ] 

Michael McCandless commented on LUCENE-3126:
--------------------------------------------

Cool idea!

> IndexWriter.addIndexes can make any incoming segment into CFS if it isn't already
> ---------------------------------------------------------------------------------
>
>                 Key: LUCENE-3126
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3126
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Shai Erera
>            Priority: Minor
>             Fix For: 3.2, 4.0
>
>
> Today, IW.addIndexes(Directory) does not modify the CFS-mode of the incoming segments. However, if IndexWriter's MP wants to create CFS (in general), there's no reason why not turn the incoming non-CFS segments into CFS. We anyway copy them, and if MP is not against CFS, we should create a CFS out of them.
> Will need to use CFW, not sure it's ready for that w/ current API (I'll need to check), but luckily we're allowed to change it (@lucene.internal).
> This should be done, IMO, even if the incoming segment is large (i.e., passes MP.noCFSRatio) b/c like I wrote above, we anyway copy it. However, if you think otherwise, speak up :).
> I'll take a look at this in the next few days.

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